纳米二氧化硅对玻璃粉水泥体系水化硬化的影响

发布时间：2018-02-08 08:39

本文关键词： 玻璃粉纳米SiO 水化机理纳米改性力学性能　出处：《硅酸盐通报》2017年06期 　论文类型：期刊论文

【摘要】：利用X射线衍射、扫描电镜及力学性能测试等手段研究了纳米SiO_2对玻璃粉水泥体系水化硬化的影响,结果表明:纳米SiO_2促进了水泥早期溶解,提高了复合体系碱度,有利于玻璃粉内部高能键(Si-O,Al-O)断裂,从而提高复合体系中玻璃粉早期水化程度;纳米SiO_2对材料凝结硬化的促进作用较大程度上缓解了掺玻璃粉体系早期性能发展不足的缺陷;纳米SiO_2的微集料效应,改善了玻璃粉水泥浆的微观结构,使得硬化浆体更为密实;纳米SiO_2的促凝作用可显著缩短复合体系凝结时间,大幅度提高其早期强度,但掺纳米SiO_2的复合胶凝材料强度存在一个极值,而5%纳米SiO_2为其最佳掺入量。
[Abstract]:The effect of nanometer SiO_2 on hydration and hardening of glass powder cement system was studied by means of X-ray diffraction, scanning electron microscope and mechanical property test. The results showed that nano SiO_2 promoted the early dissolution of cement and increased the alkalinity of composite system. It is beneficial to the internal high energy bond Si-OO Al-O fracture of glass powder, thus improving the early hydration degree of glass powder in the composite system, and the promoting effect of nanometer SiO_2 on the material setting hardening can alleviate the defect of insufficient development of the early performance of glass doped glass powder system to a great extent. The microaggregate effect of nanometer SiO_2 improves the microstructure of glass powder cement slurry and makes the hardened slurry more compact. The coagulation effect of nanometer SiO_2 can significantly shorten the setting time and increase the early strength of the composite system. However, there exists an extreme value in the strength of the composite cementing material doped with nanometer SiO_2, and 5% nanometer SiO_2 is the best addition amount.
【作者单位】：广西建筑新能源与节能重点实验室;桂林理工大学土木与建筑工程学院;桂林理工大学材料科学与工程学院;
【基金】：国家自然科学基金(51468014) 桂林理工大学创新项目(SS201604) 有色金属15-012(002501215078) 广西有色金属及特色材料加工国家重点实验室培育基地开放基金(001102215021) 广西教育厅经费资助(002501216035)
【分类号】：TQ177

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